Palladium-Catalyzed Alkylation of sp2 and sp3 C−H Bonds with Methylboroxine and Alkylboronic Acids: Two Distinct C−H Activation Pathways
摘要:
Palladium-catalyzed alkylations of sp2 and sp3 C-H bonds with either methylboroxine or alkylboronic acids were developed. Ag2O or AgCO3 is used as a crucial oxidant and promoter for the transmetalation step. Ether, ester, alcohol, and alkene functional groups are tolerated. A new C-H activation pathway differing from the cyclometalation process is elucidated using methylboroxine as the coupling partner.
Regioselectivity-Switchable Hydroarylation of Styrenes
作者:Ke Gao、Naohiko Yoshikai
DOI:10.1021/ja108809u
日期:2011.1.26
Cobalt-phosphine and cobalt-carbene catalysts have been developed for the hydroarylation of styrenes via chelation-assisted C-H bond activation, to afford branched and linear addition products, respectively, in a highly regioselective fashion. Deuterium-labeling experiments suggested a mechanism involving reversible C-H bond cleavage and olefin insertion steps and reductive elimination as the rate-
Regioselective alkylation of 2-phenylpyridines with terminal alkenes via C–H bond activation by a rhodium catalyst
作者:Yeong-Gweon Lim、Jung-Bu Kang、Yong Hae Kim
DOI:10.1039/p19960002201
日期:——
2-Phenylpyridine 1a reacts with various terminal alkenes in the presence of a rhodium(I) complex catalyst to give the corresponding mono ortho-alkylated products 2a-i and doubly alkylated products 3a-b (9:1), The same reaction using 3-methyl-2-phenylpyridine 1b gives the mono alkylated products 2j-n exclusively under the same reaction conditions due to steric hindrance between the methyl group of the pyridine and the alkyl group of 2j-n.
[EN] TRANSITION METAL-CATALYZED ALKYLATION OF C-H BONDS WITH ORGANOBORON REAGENTS<br/>[FR] ALKYLATION À CATALYSEUR À BASE DE MÉTAL DE TRANSITION DE LIAISONS C-H AVEC DES RÉACTIFS D'ORGANOBORE
申请人:BRANDEIS UNIVERSITY MS134
公开号:WO2008024953A2
公开(公告)日:2008-02-28
[EN] One aspect of the present invention relates to methods for functionalization of 2-arylpyridine and arylpyrazoles with organoboron reagents in the presence of a transition metal catalyst to furnish alkylated arylpyridines and arylpyrazoles via regioselective functionalization of sp2 -hybridized C-H bonds at a position ortho to the point of attachment of the pyridine or pyrazole ring to the aromatic nucleus, hi other embodiments, the present invention provides for alkylation of sp3-hybridized C-H bonds in alkylpyridines. [FR] Selon un mode de réalisation, la présente invention concerne des procédés de fonctionnalisation de 2-arylpyridine et d'arylpyrazoles avec des réactifs d'organobore en présence d'un catalyseur à base de métal de transition pour obtenir des arylpyridines et des arylpyrazoles par fonctionnalisation régiosélective de liaisons C-H à hybridation sp2 en une position ortho au point de liaison du cycle pyridine ou pyrazole au noyau aromatique. Selon d'autres modes de réalisation, la présente invention concerne l'alkylation de liaisons C-H dans des alkylpyridines.
Cobalt-Catalyzed Direct C(sp<sup>2</sup>
)-H Alkylation with Unactivated Alkenes
作者:Ye Lim Kim、Sun-a Park、Ju Hyun Kim
DOI:10.1002/ejoc.202000565
日期:2020.7.15
An efficient Cp*CoIII‐catalyzed direct C(sp2)–H bond alkylation with unactivated alkenes was developed, affording mono‐diarylethane products with high linear selectivity. This reaction provided a simple, practical, and atom‐economical way to construct phenethyl groups on sp2 carbon. A wide range of arenes, styrenes, and alkyl arenes were well tolerated under mild reaction conditions and showed high
开发了一种有效的Cp * Co III催化的具有未活化烯烃的直接C(sp 2)-H键烷基化反应,从而提供具有高线性选择性的单二芳基乙烷产品。该反应为在sp 2碳上构建苯乙基提供了一种简单,实用且原子经济的方法。各种芳烃,苯乙烯和烷基芳烃在温和的反应条件下均具有良好的耐受性,并具有很高的官能团相容性。
Palladium-Catalyzed Alkylation of sp<sup>2</sup> and sp<sup>3</sup> C−H Bonds with Methylboroxine and Alkylboronic Acids: Two Distinct C−H Activation Pathways
作者:Xiao Chen、Charles E. Goodhue、Jin-Quan Yu
DOI:10.1021/ja0646747
日期:2006.10.1
Palladium-catalyzed alkylations of sp2 and sp3 C-H bonds with either methylboroxine or alkylboronic acids were developed. Ag2O or AgCO3 is used as a crucial oxidant and promoter for the transmetalation step. Ether, ester, alcohol, and alkene functional groups are tolerated. A new C-H activation pathway differing from the cyclometalation process is elucidated using methylboroxine as the coupling partner.